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66 lines
2.4 KiB
66 lines
2.4 KiB
/* |
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* Copyright (C) 2014 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H |
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#define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H |
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#include <tinyalsa/asoundlib.h> |
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#include "alsa_device_profile.h" |
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typedef struct { |
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alsa_device_profile* profile; |
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struct pcm_config alsa_config; |
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struct pcm * pcm; |
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size_t frame_size; /* valid after proxy_prepare(), the frame size in bytes */ |
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uint64_t transferred; /* the total frames transferred, not cleared on standby */ |
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} alsa_device_proxy; |
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/* State */ |
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int proxy_prepare(alsa_device_proxy * proxy, alsa_device_profile * profile, |
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struct pcm_config * config); |
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int proxy_open(alsa_device_proxy * proxy); |
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void proxy_close(alsa_device_proxy * proxy); |
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int proxy_get_presentation_position(const alsa_device_proxy * proxy, |
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uint64_t *frames, struct timespec *timestamp); |
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/* Attributes */ |
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unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy); |
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enum pcm_format proxy_get_format(const alsa_device_proxy * proxy); |
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unsigned proxy_get_channel_count(const alsa_device_proxy * proxy); |
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unsigned int proxy_get_period_size(const alsa_device_proxy * proxy); |
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unsigned proxy_get_latency(const alsa_device_proxy * proxy); |
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/* |
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* Scans the provided list of sample rates and finds the first one that works. |
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* |
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* returns the index of the first rate for which the ALSA device can be opened. |
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* return negative value if none work or an error occurs. |
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*/ |
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int proxy_scan_rates(alsa_device_proxy * proxy, unsigned sample_rates[]); |
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/* I/O */ |
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int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count); |
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int proxy_read(const alsa_device_proxy * proxy, void *data, unsigned int count); |
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/* Debugging */ |
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void proxy_dump(const alsa_device_proxy * proxy, int fd); |
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#endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H */
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